Long-distance frequency dissemination with a resolution of 10-17
Christophe Daussy, Olivier Lopez, Anne Amy-Klein, Andréi N. Goncharov, Mickael Guinet, Christian Chardonnet, François Narbonneau, Michel Lours, Damien Chambon, … 展开作者
Christophe Daussy, Olivier Lopez, Anne Amy-Klein, Andréi N. Goncharov, Mickael Guinet, Christian Chardonnet, François Narbonneau, Michel Lours, Damien Chambon, Sébastien Bize, André Clairon, Georgio Santarelli, Mike E. Tobar, Andre N. Luiten
We use a new technique to disseminate microwave reference signals along ordinary optical fiber. The fractional frequency resolution of a link of 86 km in length is 10-17 for a one day integration time, a resolution higher than the stability of the best microwave or optical clocks. We use the link to compare the microwave reference and a CO2/OsO4 frequency standard that stabilizes a femtosecond laser frequency comb. This demonstrates a resolution of 3.10-14 at 1 s. An upper value of the instability introduced by the femtosecond laser-based synthesizer is estimated as 1.10-14 at 1 s.
Measuring absolute frequencies beyond the GPS limit via long-haul optical frequency dissemination
全球定位系统（GPS）频率标准的传播目前无处不在，为全世界大多数工业和研究应用提供最广泛的时间和频率参考。另一方面，全球定位系统的极限目前限制了依赖这种传播方案的高精度、科学和工业应用的进一步发展。在这里，我们证明，这些限制可以可靠地克服，即使在实验室中没有本地原子钟取代GPS与642公里长的光纤链接到远程主铯频率标准。通过这种配置，我们在$^{173}$ Yb的超冷气体中稳定地解决了$^1$ S $_0$-$^3$ P $_0$时钟转换，其精度超过了基于GPS的测量的可能性，从而消除了对本地时钟基础设施的需求，以执行超出GPS限制的高精度任务。我们还报告了文献中报道的过渡频率的准确性提高了两个数量级。
Frequency super-resolution with quantum environment engineering in a weakly coupled nuclear-spin system
School of Physics and Technology, Wuhan University（武汉大学物理科学与技术学院）；Hefei National Laboratory（合肥国家实验室）；School of Physics, Hangzhou Normal University（杭州师范大学物理学院）
Single-shot high-resolution spectroscopy of single-photon-level optical pulses using a virtually imaged phased-array and single-photon avalanche diode array
Overcoming frequency resolution limits using a solid-state spin quantum sensor
Ulm University（乌尔姆大学）；Huazhong University of Science and Technology（华中科技大学）；The Hebrew University of Jerusalem（耶路撒冷希伯来大学）；AWS Center for Quantum Computing（AWS量子计算中心）
